Remove glibc requirement for AUR pkg build

[GLobyNew]

Drop C library dependency from AUR build, as it's not actually used.

By .goreleaser.yml we don't use C at all and I've added -s -w to strip debug as you do already in goreleaser:

quien/.goreleaser.yml

Lines 3 to 7 in 34e5e73

	builds:
	- env:
	- CGO_ENABLED=0
	ldflags:
	- -s -w

I've tested the new PKGBUILD and it works as expected, also passes namcap check.

In this commit I also removed go clean -modcache as it can remove user's GLOBAL cache, not only in binary, if user would skip all steps and run only check() step.
Unlikely to happen, but anyway redundant as -modcacherw already clears cache of built package.

[retlehs]

Thank you, I meant to do this when setting up the AUR publishing workflow 🤦‍♂️ Pushed one tweak: dropped -buildmode=pie so the binary is truly static